冬季低温对CRTSⅠ型CA砂浆质量影响研究  

Influences of low temperature on CA mortar in winter

作　　者：王涛[1] 李洪刚[1] 贾恒琼[1] 李海燕[1] 

机构地区：[1]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《铁道科学与工程学报》2016年第11期2148-2153,共6页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51408610);中国铁路总公司重大课题资助项目(2013G008-A-1)

摘　　要：针对冬季CRTS（china railway track system）I型水泥乳化沥青（cement and emulsified asphalt，CA）砂浆施工，研究低温环境对CA砂浆性能的影响，经温度监测和揭板检查，比选温控措施。研究结果表明：长三角地区冬季施工现场存在-5℃-5℃的温度环境，在此环境中CA砂浆强度发展缓慢，灌入板腔的CA砂浆边缘会产生孔洞病害；在棉被覆盖保温措施条件下，无加热源时，板下砂浆温度随环境变化而小幅波动，灌注口砂浆断面有粗砂下沉趋势，但未引起分层；有加热源时，板下砂浆温度逐渐升高，揭板断面均匀，符合正线施工要求。In this paper, influences of low temperature on the performance of CA mortar were studied, and tem-perature control measures were compared and selected by temperature monitoring after pouring CA mortar andmortar assessment after removing slab track, the results show that winter environment temperature of constructionsite is lower and ranges from -5 ℃to 5 ℃in Yangtze river delta area. Under this temperature conditions, theearly strength of CA mortar develops slowly, and some large pores distresses appear in the edge of CA mortar un-der the track slab. When using cotton quilt coverage, the temperature of CA mortar under slab changes with theenvironment by fluctuation within a narrow range, cross section of mortar inlet shows coarse sand has an subsid-ence tendency without producing delamination ; under the conditions of cotton quilt coverage and heat source, thetemperature of CA mortar under slab raises gradually, with the environment by fluctuation within a narrow range,mortar assessment reveals good cross section uniformity by removing track slab, and it is completely in conformitywith the technology requirements.

关 键 词：轨道板 低温环境 CA砂浆 温控措施 

分 类 号：U2-9[交通运输工程—道路与铁道工程]